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Code points

The Unicode code point is U+00A5¥YEN SIGN (HTML &#165;·&yen;). Additionally, there is a full width character (￥) at code point U+FFE5￥FULLWIDTH YEN SIGN (HTML &#65509;· In the block "Halfwidth and Fullwidth Forms") for use with wide fonts, especially East Asian fonts.

The Latin 1 character set assigned code point A5 to the ¥ in 1985. This was quickly adopted by many computer systems which used either the ISO/IEC 8859-1 or Windows-1252 encodings. IBM Code page 437 used code point 9D for the ¥ and this encoding was also used by several other computer systems.

Japanese-language locales of Microsoft operating systems use the code page 932 character encoding, which is a variant of Shift JIS. Hence, 0x5C is displayed as a yen sign in Japanese-locale fonts on Windows.[1] It is nonetheless used wherever a backslash is used, such as the directory separator character (for example, in C:¥) and as the general escape character (¥n).[1] It is mapped onto the Unicode U+005C REVERSE SOLIDUS (i.e. backslash),[2] while Unicode U+00A5 YEN SIGN is given a one-way "best fit" mapping to 0x5C in code page 932,[1] and 0x5C is displayed as a backslash in Microsoft's documentation for code page 932,[3] essentially making it a backslash given the appearance of a yen sign by localized fonts.

The ¥ is assigned code point B2 in EBCDIC 500 and many other EBCDIC code pages.